Long side chain SEBS base alkaline polymer electrolyte membrane as well as preparation method and application thereof

Abstract

The invention provides a long side chain SEBS base alkaline polymer electrolyte membrane as well as a preparation method and application thereof. The SEBS base alkaline polymer electrolyte membrane has a long side chain structure, a positively-charged functional group in the structure is one of or more than two of quaternary ammonium salt, imidazolium salt, guanidine salt and DABCO (1,4-diazabicyclo (2.2.2) octane); the long side chain is an oxygen-containing long alkyl chain of C2-C8. The oxygen-containing long alkyl chain SEBS-base alkaline polymer electrolyte membrane prepared by the preparation method provided by the invention has better chemical stability in a high-temperature alkaline environment due to the selection of an SEBS main chain with good chemical stability and the design of a polymer molecular structure with the functional group away from the long side chain; the oxygen-containing long alkyl chain is prepared through reactant selection, reaction temperature control andoptimization of ratio among reactants; by further adopting a hot pressing or solvent evaporation method, the oxygen-containing long alkyl chain SEBS base alkaline polymer electrolyte membrane with auniform, smooth and compact surface can be prepared through controlling the casting temperature, a solvent or the pressure.

Description

technical field [0001] The invention belongs to the field of alkaline polymer electrolyte membrane; the invention also relates to the preparation of an alkaline polymer electrolyte membrane with higher electrical conductivity and better chemical stability. Background technique [0002] A fuel cell is a type of electrochemical reaction device that directly converts chemical energy in fuel (hydrogen, methanol, ethanol, etc.) into electrical energy. Compared with traditional internal combustion engines, fuel cells are not limited by the Carnot cycle, have high energy conversion efficiency, and are environmentally friendly; compared with primary and secondary batteries, fuel cells have high specific capacity, and as long as fuel is continuously supplied, they can continuously and stably output electric energy . Therefore, fuel cells have received extensive attention in recent years. [0003] Alkaline polymer electrolyte membrane fuel cells (APEMFCs) with alkaline polymer membr...

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Problems solved by technology

However, the polystyrene structure in SEBS is reduced, and this structure will lead to a significant decrease in the proportion of functional groups that can be grafted on the SEBS main chain, and there are polyalkane chain segments between polystyrenes, and the distance between polystyrenes increases. resulting in less conductivity of SEBS-based APEMs

[0007] At the same time, the main chain will also cause the degradation of functional groups, resulting in the loss of the ability of APEMs to conduct ions.

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